These were found about 5cm under the sand at the high tide mark. The white Hopper2 was 13mm long by 4.5mm wide. Identifiers are 'antenna 2' longer than first 3 body segments to over 1/2 body length. reference material at http://rsnz.natlib.govt.nz/image/rsnz_49/rsnz_49_00_0337_0294_ac_01.html